It can be your best friend, it can be your son or your dad, it can be your significant other, or it can be a mechanic (obviously the best choice). It doesn't really matter. Just have somebody to bounce conversation off of in front of the dealer. It allows you to verbally express your concerns, your doubts, and your options. That person can agree with you or bring up other points why the car isn't worth that much money. Just make sure to speak up loud enough that the salesperson hears.